/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.com.zxing.view;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;

import java.util.Collection;
import java.util.HashSet;

import cn.com.gridinfo.sooc.R;
import cn.com.gridinfo.sooc.core.my.msg.bean.*;
import cn.com.zxing.camera.CameraManager;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder rectangle and partial
 * transparency outside it, as well as the laser scanner animation and result points.
 * �Զ����View������ʱ�м���ʾ��
 */
public final class ViewfinderView extends View {

    private static final int[] SCANNER_ALPHA = {0, 64, 128, 192, 255, 192, 128, 64};
    private static final long ANIMATION_DELAY = 100L;
    private static final int OPAQUE = 0xFF;

    private final Paint paint;
    private Bitmap resultBitmap;
    private final int maskColor;
    private final int resultColor;
    private final int frameColor;
    private final int laserColor;
    private final int resultPointColor;
    private int scannerAlpha;
    private Collection<ResultPoint> possibleResultPoints;
    private Collection<ResultPoint> lastPossibleResultPoints;
    private Context context;

    // This constructor is used when the class is built from an XML resource.
    public ViewfinderView(Context context, AttributeSet attrs) {
        super(context, attrs);

        this.context = context;
        // Initialize these once for performance rather than calling them every time in onDraw().
        paint = new Paint();
        Resources resources = getResources();
        maskColor = resources.getColor(R.color.viewfinder_mask);
        resultColor = resources.getColor(R.color.result_view);
        frameColor = resources.getColor(R.color.viewfinder_frame);
        laserColor = resources.getColor(R.color.viewfinder_laser);
        resultPointColor = resources.getColor(R.color.possible_result_points);
        scannerAlpha = 1;
        possibleResultPoints = new HashSet<ResultPoint>(5);
    }

    @Override
    public void onDraw(Canvas canvas) {
        Rect frame = CameraManager.get().getFramingRect();
        if (frame == null) {
            return;
        }
        int width = canvas.getWidth();
        int height = canvas.getHeight();

        // Draw the exterior (i.e. outside the framing rect) darkened
        paint.setColor(resultBitmap != null ? resultColor : maskColor);
        canvas.drawRect(0, 0, width, frame.top, paint);
        canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
        canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
        canvas.drawRect(0, frame.bottom + 1, width, height, paint);

        //扫描框 的 绘制

        int rectwidth = 20;
        int linewidht = 5;
//        canvas.drawRect(15 + frame.left, 15 + frame.top, 15 + (linewidht + frame.left), 15 + (50 + frame.top), paint);
//        canvas.drawRect(15 + frame.left, 15 + frame.top, 15 + (50 + frame.left), 15 + (linewidht + frame.top), paint);
//        canvas.drawRect(-15 + ((0 - linewidht) + frame.right), 15 + frame.top, -15 + (1 + frame.right), 15 + (50 + frame.top), paint);
//        canvas.drawRect(-15 + (-50 + frame.right), 15 + frame.top, -15 + frame.right, 15 + (linewidht + frame.top), paint);
//        canvas.drawRect(15 + frame.left, -15 + (-49 + frame.bottom), 15 + (linewidht + frame.left), -15 + (1 + frame.bottom), paint);
//        canvas.drawRect(15 + frame.left, -15 + ((0 - linewidht) + frame.bottom), 15 + (50 + frame.left), -15 + (1 + frame.bottom), paint);
//        canvas.drawRect(-15 + ((0 - linewidht) + frame.right), -15 + (-49 + frame.bottom), -15 + (1 + frame.right), -15 + (1 + frame.bottom), paint);
//        canvas.drawRect(-15 + (-50 + frame.right), -15 + ((0 - linewidht) + frame.bottom), -15 + frame.right, -15 + (linewidht - (linewidht - 1) + frame.bottom), paint);

        paint.setColor(getResources().getColor(R.color.white));
        //画边框
        canvas.drawRect(frame.left, frame.top, frame.right - 1, frame.top + 1, paint);
        canvas.drawRect(frame.left, frame.top, frame.left + 1, frame.bottom, paint);
        canvas.drawRect(frame.right - 1, frame.top, frame.right, frame.bottom, paint);
        canvas.drawRect(frame.left, frame.bottom - 1, frame.right, frame.bottom, paint);
        //画出四个角
        paint.setColor(getResources().getColor(R.color.white));
        canvas.drawRect(frame.left, frame.top, frame.left + rectwidth, frame.top + linewidht, paint);
        canvas.drawRect(frame.left, frame.top, frame.left + linewidht, frame.top + rectwidth, paint);
        canvas.drawRect(frame.right - rectwidth, frame.top, frame.right, frame.top + linewidht, paint);
        canvas.drawRect(frame.right - linewidht, frame.top, frame.right, frame.top + rectwidth, paint);
        canvas.drawRect(frame.left, frame.bottom - linewidht, frame.left + rectwidth, frame.bottom, paint);
        canvas.drawRect(frame.left, frame.bottom - rectwidth, frame.left + linewidht, frame.bottom, paint);
        canvas.drawRect(frame.right - rectwidth, frame.bottom - linewidht, frame.right, frame.bottom, paint);
        canvas.drawRect(frame.right - linewidht, frame.bottom - rectwidth, frame.right, frame.bottom, paint);

        //画扫描框上面的字
        paint.setColor(Color.WHITE);
        paint.setTextSize(context.getResources().getDimensionPixelSize(R.dimen.font_14));
//        paint.setAlpha(0x40);
        paint.setTypeface(Typeface.create("System", Typeface.NORMAL));
        String text = "请将二维码对准扫描框, 系统会自动识别";
        float textWidth = paint.measureText(text);
        canvas.drawText(text, (width - textWidth) / 2, (float) (frame.top-60), paint);

        if (resultBitmap != null) {
            // Draw the opaque result bitmap over the scanning rectangle
            paint.setAlpha(OPAQUE);
            canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
        } else {

            // Draw a two pixel solid black border inside the framing rect
            paint.setColor(frameColor);
            canvas.drawRect(frame.left, frame.top, frame.right + 1, frame.top + 2, paint);
            canvas.drawRect(frame.left, frame.top + 2, frame.left + 2, frame.bottom - 1, paint);
            canvas.drawRect(frame.right - 1, frame.top, frame.right + 1, frame.bottom - 1, paint);
            canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1, frame.bottom + 1, paint);


            // Draw a red "laser scanner" line through the middle to show decoding is active
            paint.setColor(laserColor);
            paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
            scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
            int middle = frame.height() / 2 + frame.top;
            canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1, middle + 2, paint);

            Collection<ResultPoint> currentPossible = possibleResultPoints;
            Collection<ResultPoint> currentLast = lastPossibleResultPoints;
            if (currentPossible.isEmpty()) {
                lastPossibleResultPoints = null;
            } else {
                possibleResultPoints = new HashSet<ResultPoint>(5);
                lastPossibleResultPoints = currentPossible;
                paint.setAlpha(OPAQUE);
                paint.setColor(resultPointColor);
                for (ResultPoint point : currentPossible) {
                    canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 6.0f, paint);
                }
            }
            if (currentLast != null) {
                paint.setAlpha(OPAQUE / 2);
                paint.setColor(resultPointColor);
                for (ResultPoint point : currentLast) {
                    canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 3.0f, paint);
                }
            }

            // Request another update at the animation interval, but only repaint the laser line,
            // not the entire viewfinder mask.
            postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom);
        }
    }

    public void drawViewfinder() {
        resultBitmap = null;
        invalidate();
    }

    /**
     * Draw a bitmap with the result points highlighted instead of the live scanning display.
     *
     * @param barcode An image of the decoded barcode.
     */
    public void drawResultBitmap(Bitmap barcode) {
        resultBitmap = barcode;
        invalidate();
    }

    public void addPossibleResultPoint(ResultPoint point) {
        possibleResultPoints.add(point);
    }

}
